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Antimicrobial Activity and Rates of Tannins in Stryphnodendron adstringens *** Collected in the Brazilian Cerrado

American Journal of Plant Sciences 2013年第11期4卷 2193-2198页

作者： Giovana Maria Lanchoti Fiori Ana Lucia Fachin Valéria SCCorrea Bianca Waleria Bertoni Silvana Giuliatti Saulo Franca Amui Suzelei de Castro Franca Ana Maria Soares Pereira University of Ribeirao Preto—UNAERP Ribeirao PretoBrazil Reserve EcoCerrado Brazil AraxáBrazil Department of Genetics University of Sao Paulo—USPRibeirao PretoBrazil

Inner bark extracts of Stryphnodendron adstringens, a leguminous tree species known as Barbatimão, are often incorporated to phytotherapic formulations due to their antimicrobial and healing activities. In this study, extracts from S. adstringens accessions collected in 12 distinct locations were investigated in order to determine the rates of tannins in inner barks and to validate S. adstringens antibacterial and antifungal effectiveness. Yields of tannins were quantified by colorimetric assay following methodology described in the Brazilian Pharmacopoeia and the antimicrobial activity was determined by microdilution technique proposed by the National Committee for Clinical Laboratory Standards using S. adstringens hydroalcoholic and aqueous extracts and semi-purified fractions. Investigated extracts did not present significant antibacterial activity though aqueous extracts exhibited antifungal effect against both Trichophyton rubrum mutant and clinical strains (MIC 156 μg/mL). A positive correlation between tannin concentration and antifungal activity was observed and the accessions collected in Delfinópolis (MG) were considered elite.

关键词： Cerrado Barbatimao Genetic Diversity phytoterapy

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